#include<stdio.h> //printf                                                                                                  
 #include<string.h> //memset                                                                                                 
 #include<stdlib.h> //for exit(0);                                                                                           
 #include<sys/socket.h>                                                                                                      
 #include<errno.h> //For errno - the error number                                                                            
 #include<netdb.h> //hostent                                                                                                 
 #include<arpa/inet.h>                                                                                                       
                                                                                                                             
 int hostname_to_ip(char *  , char *);                                                                                       
                                                                                                                             
 int main(int argc , char *argv[])                                                                                           
 {                                                                                                                           
         if(argc <2)                                                                                                         
         {                                                                                                                   
                 printf("Please provide a hostname to resolve");                                                             
                 exit(1);                                                                                                    
         }                                                                                                                   
                                                                                                                             
         char *hostname = argv[1];                                                                                           
         char ip[100];                                                                                                       
                                                                                                                             
         hostname_to_ip(hostname , ip);                                                                                      
         printf("%s resolved to %s" , hostname , ip);                                                                        
                                                                                                                             
         printf("\n");                                                                                                       
                                                                                                                             
 }

 /*                                                                                                                          
  *       Get ip from domain name
  */                                                                                                                         
int hostname_to_ip(char *hostname , char *ip)                                                                               
 {                                                                                                                           
         int sockfd;                                                                                                         
         struct addrinfo hints, *servinfo, *p;                                                                               
         struct sockaddr_in *h;                                                                                              
         int rv;                                                                                                             
                                                                                                                             
         memset(&hints, 0, sizeof hints);                                                                                    
         hints.ai_family = AF_UNSPEC; // use AF_INET6 to force IPv6                                                          
         hints.ai_socktype = SOCK_STREAM;                                                                                    
                                                                                                                             
         if ( (rv = getaddrinfo( hostname , "http" , &hints , &servinfo)) != 0)                                              
         {                                                                                                                   
                 fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv));                                                     
                 return 1;                                                                                                   
         }                                                                                                                   
                                                                                                                             
         // loop through all the results and connect to the first we can                                                     
         for(p = servinfo; p != NULL; p = p->ai_next)                                                                        
         {                                                                                                                   
                 h = (struct sockaddr_in *) p->ai_addr;                                                                      
                 strcpy(ip , inet_ntoa( h->sin_addr ) );                                                                     
         }                                                                                                                   
                                                                                                                             
         freeaddrinfo(servinfo); // all done with this structure                                                             
         return 0;                                                                                                           
 }